Issue #1821420 by vijaycs85, cam8001, Albert Volkman, ACF, typhonius, pcambra, Berdir: Convert mail variables to cmi.

Issue #1919910 by larowlan: Refactor custom_block() upgrade path to create tables using hook_schema_0() instead of in block_update_N().

Issue #1915774 by tim.plunkett, amateescu, Crell, dawehner: Decide whether core route controllers should generally/always be DIC services or not.

Issue #1934788 by sun: 'Administration role' setting in User Account settings form defaults to first, randomly available user role.

Issue #1849752 by effulgentsia, Berdir, jibran, neclimdul: Abstract non-Drupal-specific parts of AnnotatedClassDiscovery into a Drupal\Component base class.

Issue #1049050 by mfb, TwoD, David_Rothstein, jpsoto: Fixed file_stream_wrapper_uri_normalize(): remove dead code.

Issue #1929136 by Gábor Hojtsy, alexpott, YesCT: Fixed override-free context, move global config overrides back to an event listener.

Issue #788114 by quicksketch, David_Rothstein, sun, Wim Leers: Unprivileged users should only get one text format by default.

Issue #1893108 follow-up by Berdir, dawehner: Rename EntityUnitBaseTest => EntityUnitTestBase to conform to coding standards.

Issue #1591806 by tim.plunkett, ryanissamson, jenlampton, Risse, psynaptic, Gábor Hojtsy, kmcculloch, pakmanlh, Rob Loach: Change block 'subject' so that it's called (admin_)label like everything else on the theme layer.

Issue #1848880 by Wim Leers, effulgentsia: Test order of AJAX commands: add Ajax\FrameworkTest::testOrder(), strengthen testLazyLoad(), fix JS settings not being prepended.

Issue #1884148 by sun, swentel: Fixed field widget disappears when increase cardinality for image to allow multiple values.

Issue #1662974 by barraponto, droplet, Albert Volkman, nitvirus, roborn, David Hernández: Clean up css in dblog.

Issue #1922396 by damiankloip: Add groupable_only() parameter to DisplayPluginBase::getFieldLabels().

Issue #1829224 by alexpott, pfrenssen, vijaycs85, lirantal: Convert the 'theme_default()' variable to CMI.

Issue #1929656 by dawehner: Fixed ModuleHandler::setModuleList() should call resetImplementations() in order to avoid edge cases.

Issue #1919934 by larowlan: Change key of custom block vertical tabs to use 'advanced' instead of 'additional_settings()'.

Issue #1836008 by dawehner, Berdir, alexpott, katbailey, effulgentsia, EclipseGc: Fixed Remove drupal_classloader() use in Drupal\Core\AnnotatedClassDiscovery.